'Numeric Demonstrator', c 1900.
Image number: 10327841
This elementary arithmetical teaching apparatus, patented by Ethel Linay in about 1900, consists of ten wooden rods with squared paper pasted on them in order to show multiplication visually.
- Image number:
- Science Museum/Science & Society Picture Library
- Date taken:
- 30 October 2003 09:16
- Image rights:
- Science Museum